Many styrenemolecules bond together to make a polystyrene molecule. The squiggly lines show that the long polystyrene molecule goes on farther at both ends.

Styrene can also bond with other kinds of monomers to make other kinds of polymers called copolymers. For one example, styrene has been mixed with another monomer called 1,3-butadiene to make a copolymer which is a kind of synthetic rubber. For another example, styrene is mixed with acrylonitrile and 1,3-butadiene to make a copolymer plastic called ABS (Acrylonitrile-Butadiene-Styrene).